岩体裂隙受内压力的弹塑性分析

岩体裂隙内常充满具有压力的水或软弱填充物，裂隙受内压荷载扩展破坏是岩土工程关心的问题。将该问题等效为裂隙面受一对I型拉力作用的弹塑性断裂力学问题，采用裂隙线附近分析方法，从平衡方程和岩桥材料的破坏准则出发求解裂隙线附近的塑性应力场，将该应力场与弹性应力场在其弹塑性边界上进行匹配，得出裂隙内的压力大小与裂隙扩展长度之间的关系，以及岩桥断裂时的最大承载力。

Elastoplastic analysis of rock-mass fissures under internal pressure

The water or soft matter is often filled in the fissures of rock masses. The fracture of a rock-mass fissure under the internal pressure is an important problem in the geotechnical engineering. It is simplified as the plane stress problem of a fissure loaded by I mode with a pair of internal point forces in the finite rock mass. The plastic stress fields in the zone near fissure line are solved using the near fissure line method on the basis of the failure criterion of rock bridge material and differential equilibrium equations. By matching the plastic stress fields with the reasonable elastic stress fields at the elastoplastic boundary, relationship between the internal pressures and cracked region lengths on the fissure line is obtained. The bearing capacity of rock bridges is also given.